Water on the Edge: Hydrogen Bonding through the Looking Glass of Surface-Selective Vibrational Spectroscopy

Seminar series
Physical Chemistry Seminar
Mon, May 20 4:00pm
2033 Young Hall
Speaker Professor Alexander V. Benderskii
University of Southern California
Dept. of Chemistry

Abstract: We will review the surface-selective vibrational sum frequency generation (VSFG) spectroscopy as a probe of the hydrogen bond network at the air-water interface.  Water’s two intrinsic vibrational modes, stretch and bend, both report on the hydrogen bonding but in different ways.  VSFG measurements of the stretch and bend spectra of the air/water interface will be presented and the line shapes analyzed in terms of their information content.  In particular, we focus on the “free OH” species of water molecules straddling the interface, which probe hydrogen bonds in the first monolayer of waters, and compare these with bulk water H-bonds.